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What can cause an E21 fault on the Altivar ATV21 and ATV212 drives?

Issue:
What can cause an E21 fault on the Altivar  ATV21 and ATV212 drives?

Product Line:
Altivar ATV21 and ATV212

Environment:
All

Cause:
Drive powers up with an E21 CPU is failing

Resolution:
The E21 is a CPU error 2 fault.   If you power cycle and the fault does not clear the drive will need to be replaced.
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